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42-390
codefox1
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Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
#2

08-06-2010, 10:00 AM
The 7X7 is same as XXFM tube. Test for filament continuity (pins 1 and 8 of the tube, and it's socket as well for filament voltage.) This is a small signal tube, and will not become very warm in use if it is good.

You can get a schematic on this forum.

Replace all the electrolytic capacitors, as well as the paper ones as well. They're over 50almost 60 years old!

More help available here and elsewhere.
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42-390 - by Guest - 08-05-2010, 02:21 PM
Re: 42-390 - by codefox1 - 08-06-2010, 10:00 AM
Re: 42-390 - by Ron Ramirez - 08-09-2010, 02:34 PM
Re: 42-390 - by Guest - 08-10-2010, 07:52 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Home Radios